diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/gpu/gl/GrGLIRect.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/src/gpu/gl/GrGLIRect.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+
+#ifndef GrGLIRect_DEFINED
+#define GrGLIRect_DEFINED
+
+#include "gl/GrGLInterface.h"
+#include "GrGLUtil.h"
+
+/**
+ * Helper struct for dealing with the fact that Ganesh and GL use different
+ * window coordinate systems (top-down vs bottom-up)
+ */
+struct GrGLIRect {
+    GrGLint   fLeft;
+    GrGLint   fBottom;
+    GrGLsizei fWidth;
+    GrGLsizei fHeight;
+
+    void pushToGLViewport(const GrGLInterface* gl) const {
+        GR_GL_CALL(gl, Viewport(fLeft, fBottom, fWidth, fHeight));
+    }
+
+    void pushToGLScissor(const GrGLInterface* gl) const {
+        GR_GL_CALL(gl, Scissor(fLeft, fBottom, fWidth, fHeight));
+    }
+
+    void setFromGLViewport(const GrGLInterface* gl) {
+        GR_STATIC_ASSERT(sizeof(GrGLIRect) == 4*sizeof(GrGLint));
+        GR_GL_GetIntegerv(gl, GR_GL_VIEWPORT, (GrGLint*) this);
+    }
+
+    // sometimes we have a SkIRect from the client that we
+    // want to simultaneously make relative to GL's viewport
+    // and (optionally) convert from top-down to bottom-up.
+    void setRelativeTo(const GrGLIRect& glRect,
+                       int leftOffset,
+                       int topOffset,
+                       int width,
+                       int height,
+                       GrSurfaceOrigin origin) {
+        fLeft = glRect.fLeft + leftOffset;
+        fWidth = width;
+        if (kBottomLeft_GrSurfaceOrigin == origin) {
+            fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height);
+        } else {
+            fBottom = glRect.fBottom + topOffset;
+        }
+        fHeight = height;
+
+        SkASSERT(fLeft >= 0);
+        SkASSERT(fWidth >= 0);
+        SkASSERT(fBottom >= 0);
+        SkASSERT(fHeight >= 0);
+    }
+
+    bool contains(const GrGLIRect& glRect) const {
+        return fLeft <= glRect.fLeft &&
+               fBottom <= glRect.fBottom &&
+               fLeft + fWidth >=  glRect.fLeft + glRect.fWidth &&
+               fBottom + fHeight >=  glRect.fBottom + glRect.fHeight;
+    }
+
+    void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;}
+
+    bool operator ==(const GrGLIRect& glRect) const {
+        return 0 == memcmp(this, &glRect, sizeof(GrGLIRect));
+    }
+
+    bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);}
+};
+
+#endif